9
SPECIAL VENT INSTALLATIONS
BGD36CF(G)
PERISCOPE TERMINATION
Use the GD201 periscope kit to locate the air termination above grade. The periscope must be installed so that when fi nal grading is completed, the bottom air slot is located a minimum of 12" above grade. The maximum allowable vent length is 10'.
CORNER TERMINATION
The maximum vent length for a corner installation is 20" of horizontal run, in addition to the 45° offset. In this case zero rise is acceptable when using rigid. See FIGURE 18. Flexible venting must maintain a 6" rise. See FIGURE 19.
FIGURE 18
FIGURE 15 | FIGURE 16 |
TOP EXIT INSTALLATION | REAR EXIT INSTALLATION |
FIGURE 19
BGD42CF
PERISCOPE TERMINATION
Use the GD401 periscope kit to locate the air termination above grade. The periscope must be installed so that when fi nal grading is completed, the bottom air slot is located a minimum of 12" above grade. The maximum allowable vent length is 10'.
FIGURE 17